CN116231584A - Low-voltage switch leakage monitoring and protecting module - Google Patents
Low-voltage switch leakage monitoring and protecting module Download PDFInfo
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- CN116231584A CN116231584A CN202310230585.5A CN202310230585A CN116231584A CN 116231584 A CN116231584 A CN 116231584A CN 202310230585 A CN202310230585 A CN 202310230585A CN 116231584 A CN116231584 A CN 116231584A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention relates to the technical field of leakage monitoring, in particular to a leakage monitoring and protecting module of a low-voltage switch, which comprises a leakage waveform monitoring part and a leakage protecting part, wherein the leakage waveform monitoring part comprises a first zero sequence transformer, a sampling module and an amplifying module, and the leakage protecting part comprises a second zero sequence transformer, a leakage trigger threshold switching module, a leakage detecting module and a tripping module. The invention can monitor various leakage current data in real time and simultaneously realize leakage protection.
Description
Technical Field
The invention relates to the technical field of leakage monitoring, in particular to a low-voltage switch leakage monitoring and protecting module.
Background
The leakage protection is a safety protection measure which can automatically cut off a power supply or send out an alarm signal when the leakage current of the power grid exceeds a certain set value, and the leakage protection in the power grid can prevent the personal electric shock casualties. Earth leakage protection is a safety technical measure for preventing electrical accidents by using an earth leakage protection device. The leakage protection device is also called residual current protection device. The leakage protection device is a low-voltage safety protection electric appliance, and has the functions that:
1. for preventing single-phase electric shock accidents caused by electric leakage;
2. for preventing fire and equipment burn-out accidents caused by electric leakage;
3. for detecting and cutting off various one-phase ground faults;
the current common leakage protection device has the following defects and shortages:
1) Leakage current is fixed and not adjustable
For example, the nominal leakage protection current of the leakage protection device is 100mA, when the leakage current reaches 100mA or exceeds 100mA in practical application, corresponding protection measures are only performed, and if the leakage current is intended to be applied to a scene requiring 30mA for protection, the protection cannot be realized.
2) Leakage current data can not be acquired, and the application range is narrow
For example, the user may wish to observe the leakage current waveform when the user is leaking electricity, or the user may wish to observe the leakage current data in real time, which cannot be achieved.
Disclosure of Invention
The invention provides a leakage monitoring and protecting module for a low-voltage switch, which can monitor various leakage current data in real time and simultaneously realize leakage protection.
In order to achieve the purpose of the invention, the technical scheme adopted is as follows: the leakage monitoring and protecting module of the low-voltage switch comprises a leakage waveform monitoring part and a leakage protecting part, wherein the leakage waveform monitoring part comprises a first zero-sequence transformer, a sampling module and an amplifying module, the leakage protecting part comprises a second zero-sequence transformer, a leakage trigger threshold switching module, a leakage detecting module and a tripping module, and when a power grid is in leakage, the first zero-sequence transformer and the second zero-sequence transformer both induce weak leakage current signals; the sampling module converts the weak leakage current signal into a weak voltage signal, and the amplifying module converts the weak voltage signal into a waveform signal which is provided for external monitoring equipment through an external interface; the leakage detection module detects whether the leakage current exceeds a leakage trigger threshold, when the leakage current exceeds the threshold, the tripping module is triggered, the tripping module provides tripping signals for external protection equipment through an external interface, and the leakage trigger threshold switching module is used for changing the leakage trigger threshold of the leakage detection module.
As an optimization scheme of the invention, the leakage waveform monitoring part and the leakage protection part are positioned in a cavity formed by the upper module cover and the lower module cover.
As an optimization scheme of the invention, the leakage triggering threshold value switching module comprises a dial switch K1, an eleventh resistor R11, a fifteenth resistor R15, a thirteenth resistor R13, a tenth resistor R10, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twenty-first resistor R21, a fourteenth resistor R14, a twelfth resistor R12, a twentieth resistor R20 and a twenty-third resistor R23, wherein the eleventh resistor R11, the fifteenth resistor R15 and the thirteenth resistor R13 are connected in series between a 1 st pin and a 4 th pin of the dial switch K1, the tenth resistor R10, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19 and the twenty-first resistor R21 are connected in series between a 5 th pin and a 6 pin of the dial switch K1, the fourteenth resistor R14 is connected in series between a 6 th pin and a 7 pin of the dial switch K1, and the twelfth resistor R12, the twenty-first resistor R20 and the twenty-third resistor R23 are connected in series between a 1 st pin and a 7 pin.
As an optimization scheme of the invention, the leakage detection module comprises a leakage detection chip U1, a first capacitor C1, a zener diode ZD1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a fourth capacitor C4, a controllable silicon D1, a seventh capacitor C7, a third capacitor C3, a sixth capacitor C6, an eighth resistor R8, an eighth capacitor C8 and a second capacitor C2, wherein the first capacitor C1 and the zener diode ZD1 are connected in parallel between an 8 th pin and a 3 rd pin of the leakage detection chip U1, the second capacitor C2 is connected between a 1 st pin and a 3 rd pin of the leakage detection chip U1, the eighth resistor R8 and the eighth capacitor C8 are connected in series between a 1 st pin and a 2 nd pin of the leakage detection chip U1, the 4 th pin and the fourth capacitor C5 pin of the leakage detection chip U1 are grounded through the sixth capacitor C6, the seventh pin 6 of the leakage detection chip U1 is connected in series between the fourth resistor R7 and the fourth resistor R3, and the fourth pin of the fourth resistor R7 is connected in series between the fourth resistor R7 and the fourth pin and the fourth resistor R3.
As an optimized scheme of the invention, the tripping module comprises a rectifier bridge BR1 and a piezoresistor MOV2, wherein the piezoresistor MOV2 is connected between a 2 nd pin and a 3 rd pin of the rectifier bridge BR 1.
As an optimization scheme of the invention, the low-voltage switch leakage monitoring and protecting module is suitable for single-phase electricity or three-phase electricity.
The invention has the positive effects that: 1) The applicable leakage protection current is adjustable, and the application scene is wide;
2) The invention can collect leakage current signals, and is convenient for other equipment to analyze and process;
3) The invention can monitor the leakage current data in real time, the leakage waveform monitoring part and the leakage protection part are completely isolated, the mutual influence is avoided, and the electromagnetic compatibility is good;
4) The invention can be simultaneously applied to leakage monitoring of single-phase electricity and three-phase electricity.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic block diagram of the method of the present invention;
FIG. 2 is a schematic diagram of the structure of the present invention;
FIG. 3 is a schematic circuit diagram of a sampling module according to the present invention;
FIG. 4 is a schematic circuit diagram of an amplification module of the present invention;
FIG. 5 is a schematic circuit diagram of the leakage trigger threshold switching module according to the present invention;
FIG. 6 is a schematic diagram of the circuit principle of the leakage detection module and trip module of the present invention;
fig. 7 is a schematic diagram of the circuit principle of the present invention applied to single-phase power and three-phase power.
Wherein: 1. module upper cover, 2, circuit board, 3, zero sequence transformer, 4, threshold switches dial switch, 5, module lower cover.
Detailed Description
As shown in fig. 1, the invention discloses a leakage monitoring and protecting module of a low-voltage switch, which comprises a leakage waveform monitoring part and a leakage protecting part, wherein the leakage waveform monitoring part comprises a first zero sequence transformer, a sampling module and an amplifying module, the leakage protecting part comprises a second zero sequence transformer, a leakage trigger threshold switching module, a leakage detecting module and a tripping module, and when a power grid leaks, the first zero sequence transformer and the second zero sequence transformer both induce weak leakage current signals; the sampling module converts the weak leakage current signal into a weak voltage signal, and the amplifying module converts the weak voltage signal into a waveform signal which is provided for external monitoring equipment through an external interface; the leakage detection module detects whether the leakage current exceeds a leakage trigger threshold value, when the leakage current exceeds the threshold value, the tripping module is triggered, the tripping module provides tripping signals for external protection equipment through an external interface, and the leakage trigger threshold value switching module is used for changing the leakage trigger threshold value of the leakage detection module.
As shown in fig. 2, the zero sequence transformer 3 comprises a first zero sequence transformer and a second zero sequence transformer. The leakage waveform monitoring part and the leakage protection part are positioned in a cavity formed by the upper module cover 1 and the lower module cover 5. The sampling module, the amplifying module, the leakage trigger threshold switching module, the leakage detection module and the tripping module are all positioned on the circuit board 2.
As shown in fig. 3, when the zero sequence current i0ct+ generated by the first zero sequence transformer passes through the forty-third resistor R43 and the forty-fifth resistor R45 of the sampling module, a weak voltage signal is generated.
As shown in fig. 4, when the weak voltage signal generated from the sampling module is amplified by the operational amplifier of the amplifying module, the generated weak voltage is amplified into a waveform signal which can be collected and provided to the external monitoring device through the external interface, and the external monitoring device can save and observe leakage current data in real time.
As shown in fig. 5, the leakage trigger threshold switching module includes a dial switch K1, an eleventh resistor R11, a fifteenth resistor R15, a thirteenth resistor R13, a tenth resistor R10, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twenty first resistor R21, a fourteenth resistor R14, a twelfth resistor R12, a twentieth resistor R20, and a twenty third resistor R23, wherein the eleventh resistor R11, the fifteenth resistor R15, and the thirteenth resistor R13 are connected in series between the 1 st pin and the 4 th pin of the dial switch K1, the tenth resistor R10, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, the twenty first resistor R21 are connected in series between the 5 th pin and the 6 pin of the dial switch K1, the fourteenth resistor R14 is connected in series between the 6 th pin and the 7 th pin of the dial switch K1, and the twelfth resistor R12, the twenty first resistor R20 and the thirteenth resistor R23 are connected in series between the 7 th pin and the dial switch K1. The dial switch K1 is a threshold value switching dial switch 2 in fig. 2, and the threshold value switching dial switch 2 is mounted on the front panel of the module lower cover. When the dial switch K1 is in the range of 1-2, the sampling resistor is the series resistor of R15 and R13, when the switch position is in the range of 2-3, the sampling resistor is the series resistor of R11 and R13, when the dial switch K1 is in the range of 2-4, the sampling resistor is R11, the resistance value of the sampling resistor is changed by changing the switch position of the dial switch K1, and when the same voltage and different resistors are used, different leakage currents are generated, and then the switching between the leakage trigger thresholds is realized. The leakage trigger threshold value can be set to be 30mA/100mA/300mA, and the switching of different leakage trigger threshold values can be realized by shifting the switch position of the dial switch K1 to different gears.
As shown in fig. 6, the leakage detection module includes a leakage detection chip U1, a first capacitor C1, a zener diode ZD1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a fourth capacitor C4, a thyristor D1, a seventh capacitor C7, a third capacitor C3, a sixth capacitor C6, an eighth resistor R8, an eighth capacitor C8, and a second capacitor C2, wherein the first capacitor C1 and the zener diode ZD1 are connected in parallel between the 8 th pin and the 3 rd pin of the leakage detection chip U1, the second capacitor C2 is connected between the 1 st pin and the 3 rd pin of the leakage detection chip U1, the eighth resistor R8 and the eighth capacitor C8 are connected in series between the 1 st pin and the 2 nd pin of the leakage detection chip U1, the 4 th pin and the 5 pin of the detection chip U1 are all grounded through the sixth capacitor C6, the 6 th pin of the leakage detection chip U1 is connected in series between the seventh capacitor C7 and the third capacitor C3R 7 and the fourth resistor R3, and the fourth pin of the fourth resistor R7 is connected in series between the fourth resistor R4 and the fourth pin of the fourth resistor R1. The sampling resistor and the zero sequence currents CT+ and CT-at the positions of different dial switches K1 are combined to generate a voltage signal which is fed back to the leakage detection chip U1 to realize the leakage monitoring function. The switching dial switch K1 can change the sampling resistance value, and after the sampling resistance is changed, the output leakage trigger threshold value of the leakage detection chip U1 is also changed, which is equivalent to the change of the trigger threshold value of the tripping module.
The tripping module comprises a rectifier bridge BR1 and a piezoresistor MOV2, wherein the piezoresistor MOV2 is connected between the 2 nd pin and the 3 rd pin of the rectifier bridge BR 1. When the leakage current detection chip U1 detects that the leakage current exceeds the threshold value set by the dial switch K1, the tripping module can give a trigger signal to external protection equipment, and the external protection equipment performs protection or other processing (such as switching off and the like) according to the characteristics of the external protection equipment.
As shown in fig. 7, the low-voltage switch leakage monitoring and protection module is suitable for single-phase power or three-phase power. When three-phase power is used, ABC has voltages in three phases, and the voltages are rectified by D1-D6 and then output AC_ L, AC _N to supply power to the module, wherein D1-D6 are rectifier diodes. When single-phase power is used, one phase in the A/B/C is connected at will, and AC_ L, AC _N is output to power the module after rectification of D1-D6.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (6)
1. The utility model provides a low voltage switch electric leakage monitoring and protection module which characterized in that: the leakage protection part comprises a second zero sequence transformer, a leakage trigger threshold switching module, a leakage detection module and a tripping module, and when the electric network is in leakage, the first zero sequence transformer and the second zero sequence transformer both sense weak leakage current signals; the sampling module converts the weak leakage current signal into a weak voltage signal, and the amplifying module converts the weak voltage signal into a waveform signal which is provided for external monitoring equipment through an external interface; the leakage detection module detects whether the leakage current exceeds a leakage trigger threshold, when the leakage current exceeds the threshold, the tripping module is triggered, the tripping module provides tripping signals for external protection equipment through an external interface, and the leakage trigger threshold switching module is used for changing the leakage trigger threshold of the leakage detection module.
2. The low voltage switch leakage monitoring and protection module of claim 1, wherein: the leakage waveform monitoring part and the leakage protection part are positioned in a cavity formed by the upper module cover (1) and the lower module cover (5).
3. The low voltage switch leakage monitoring and protection module of claim 2, wherein: the leakage triggering threshold value switching module comprises a dial switch K1, an eleventh resistor R11, a fifteenth resistor R15, a thirteenth resistor R13, a tenth resistor R10, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twenty first resistor R21, a fourteenth resistor R14, a twelfth resistor R12, a twentieth resistor R20 and a twenty third resistor R23, wherein the eleventh resistor R11, the fifteenth resistor R15 and the thirteenth resistor R13 are connected in series between a 1 st pin and a 4 th pin of the dial switch K1, the tenth resistor R10, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19 and the twenty first resistor R21 are connected in series between a 5 th pin and a 6 pin of the dial switch K1, the fourteenth resistor R14 is connected in series between a 6 th pin and a 7 pin of the dial switch K1, and the twelfth resistor R12, the twenty third resistor R20 and the twenty third resistor R23 are connected in series between a 7 th pin and a 7 pin of the dial switch K1.
4. A low voltage switch leakage monitoring and protection module according to claim 3, wherein: the leakage detection module comprises a leakage detection chip U1, a first capacitor C1, a voltage stabilizing diode ZD1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a fourth capacitor C4, a controllable silicon D1, a seventh capacitor C7, a third capacitor C3, a sixth capacitor C6, an eighth resistor R8, an eighth capacitor C8 and a second capacitor C2, wherein the first capacitor C1 and the voltage stabilizing diode ZD1 are connected in parallel between an 8 th pin and a 3 rd pin of the leakage detection chip U1, the second capacitor C2 is connected between a 1 st pin and a 3 rd pin of the leakage detection chip U1, the eighth resistor R8 and the eighth capacitor C8 are connected in series between a 1 st pin and a 2 nd pin of the leakage detection chip U1, the 4 th pin and the 5 pin of the leakage detection chip U1 are all grounded through the sixth capacitor C6, the 6 pin of the leakage detection chip U1 is connected in series between the fourth resistor R7 and the fourth resistor R4 through the seventh capacitor C7 and the third capacitor C3, and the fourth resistor R7 is connected between the fourth pin and the fourth resistor R1 and the fourth pin and the fourth resistor R4.
5. The leakage monitoring and protection module for a low voltage switch of claim 4, wherein: the tripping module comprises a rectifier bridge BR1 and a piezoresistor MOV2, and the piezoresistor MOV2 is connected between a 2 nd pin and a 3 rd pin of the rectifier bridge BR 1.
6. The low voltage switch leakage monitoring and protection module of claim 1, wherein: the low-voltage switch leakage monitoring and protecting module is suitable for single-phase electricity or three-phase electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310230585.5A CN116231584A (en) | 2023-03-11 | 2023-03-11 | Low-voltage switch leakage monitoring and protecting module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310230585.5A CN116231584A (en) | 2023-03-11 | 2023-03-11 | Low-voltage switch leakage monitoring and protecting module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116231584A true CN116231584A (en) | 2023-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310230585.5A Pending CN116231584A (en) | 2023-03-11 | 2023-03-11 | Low-voltage switch leakage monitoring and protecting module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116231584A (en) |
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2023
- 2023-03-11 CN CN202310230585.5A patent/CN116231584A/en active Pending
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